#include <iostream>
#include <cstdlib>
#include <unistd.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

using namespace std;

void User(const string &proc)
{
    std::cout << "\n\rUsage: " << proc << " serverip serverport\n"
              << std::endl;
}

int main(int argc, char *argv[])
{
    if (argc != 3)
    {
        User(argv[0]);
        exit(0);
    }
    std::string serverip = argv[1];
    uint16_t serverport = std::stoi(argv[2]);

    struct sockaddr_in server;
    bzero(&server, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(serverport); //?
    server.sin_addr.s_addr = inet_addr(serverip.c_str());
    socklen_t len = sizeof(server);

    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0)
    {
        cout << "socker error" << endl;
        return 1;
    }

    // 当我们首次发送消息时，系统会为我们自动bind

    while (true)
    {
        printf("Plase Enter#");
        string send;
        getline(cin, send);
        sendto(sockfd, send.c_str(), send.size(), 0, (struct sockaddr *)&server, len);

        //接收服务器返回的消息
        char buffer[1024];
        struct sockaddr_in temp;
        socklen_t len=sizeof(temp);
        recvfrom(sockfd,buffer,sizeof(buffer)-1,0,(struct sockaddr*)&temp,&len);
        cout<<buffer<<endl;
    }

    return 0;
}